Textbox inside datagrid - Value doesn't change for the textbox

07-03-2009 3:01 AM |

Hi All,

       My problem is when the textbox has value(e.g 2) and if I edit to a new value with appending 1 to existing value(e.g 21) than it won't work and if I remove the old value and type a new value(e.g 3) than it works.. any idea??

     <data:DataGrid MinHeight="100"  ItemsSource="{Binding POSProductsList,Source={StaticResource POSViewModel},Mode=TwoWay}"  RowHeight="30" HorizontalAlignment="Stretch"  Height="Auto" Width="Auto" Margin="10" HorizontalContentAlignment="Left"  AutoGenerateColumns="false">
                        <data:DataGrid.Columns>
                           
                            <data:DataGridTemplateColumn Header="Qty" Width="Auto"   MinWidth="80" MaxWidth="300" >
                                <data:DataGridTemplateColumn.CellTemplate>
                                    <DataTemplate>
                                        <TextBlock  VerticalAlignment="Center" HorizontalAlignment="Left" Margin="5,0,0,0" Text="{Binding Quantity,Mode=TwoWay}"></TextBlock>
                                    </DataTemplate>
                                </data:DataGridTemplateColumn.CellTemplate>
                                <data:DataGridTemplateColumn.CellEditingTemplate>
                                    <DataTemplate>
                                        <TextBox LostFocus="txtQuantity_LostFocus" Text="{Binding Quantity,Mode=TwoWay}" Width="60"  VerticalAlignment="Center" HorizontalAlignment="Center"  x:Name="txtQuantity" >
                                        </TextBox>
                                    </DataTemplate>
                                </data:DataGridTemplateColumn.CellEditingTemplate>
                            </data:DataGridTemplateColumn>                         
                        </data:DataGrid.Columns>
                    </data:DataGrid> 

Here my model class
public class POSViewModel : ViewModelBase
    {

            ObservableCollection<Model.POSProducts> _posproductslist;
        public ObservableCollection<Model.POSProducts> POSProductsList
        {
            get
            {
                return _posproductslist;
            }
            set
            {
                _posproductslist = value;
                this.RaisePropertyChanged("POSProductsList");
            }
 }      

Here my POSProducts class

public class POSProducts : ModelBase
    {

           private int? _quantity;
        public int? Quantity
        {
            get
            {
                return _quantity;
            }
            set
            {
                try
                {
                    if (value < 0)
                    {
                        MessageBox.Show("Invalid Quantity");
                        return;
                    }
                    _quantity = value;
                    this.RaisePropertyChanged("Quantity");
                    this.RaisePropertyChanged("TotalCost");

                }
                catch
                {
                    MessageBox.Show("Invalid Quantity");
                }
            }
        }

}

Re: Textbox inside datagrid - Value doesn't change for the textbox

07-03-2009 10:10 AM |

 The simple answer here is the user entered bad data so your property is never updated.

You can handle the NotifyOnValidationError to catch when the user enters bad data

http://msdn.microsoft.com/en-us/library/system.windows.data.binding.notifyonvalidationerror%28VS.95%29.aspx

Re: Re: Textbox inside datagrid - Value doesn't change for the textbox

07-03-2009 5:01 PM |

 Thanks ken for your answer, but I think you misunderstood the question. my problem is user is entering correct data still the value doesn't change if the textbox has already value and if i remove that value and than change than it will work

Re: Re: Re: Textbox inside datagrid - Value doesn't change for the textbox

07-06-2009 1:41 AM |

 I am using Silverlight 3